Context

Context of Preliminary report concerning explorations and surveys, principally in Nevada and Arizona : Prosecuted in accordance with paragraph 2, special orders no. 109, War Department, March 18, 1871, and letter of instructions of March 23, 1871, from Brigadier General A.A. Humphreys, Chief of Engineers. Conducted under the immediate direction of 1st Lieut. George M. Wheeler, Corps of Engineers. 1871
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